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Refractive optics to compensate x-ray mirror shape-errors

DOI: 10.1117/12.2275134 DOI Help

Authors: David Laundy (Diamond Light Source) , Vishal Dhamgaye (Raj Ramanna Centre for Advanced Technology) , Ian Pape (Diamond Light Source) , Kawal Sawhney (Diamond Light Source)
Co-authored by industrial partner: No

Type: Conference Paper
Conference: Advances in X-Ray/EUV Optics and Components XII
Peer Reviewed: No

State: Published (Approved)
Published: August 2017

Abstract: Elliptically profiled mirrors operating at glancing angle are frequently used at X-ray synchrotron sources to focus X-rays into sub-micrometer sized spots. Mirror figure error, defined as the height difference function between the actual mirror surface and the ideal elliptical profile, causes a perturbation of the X-ray wavefront for X- rays reflecting from the mirror. This perturbation, when propagated to the focal plane results in an increase in the size of the focused beam. At Diamond Light Source we are developing refractive optics that can be used to locally cancel out the wavefront distortion caused by figure error from nano-focusing elliptical mirrors. These optics could be used to correct existing optical components on synchrotron radiation beamlines in order to give focused X-ray beam sizes approaching the theoretical diffraction limit. We present our latest results showing measurement of the X-ray wavefront error after reflection from X-ray mirrors and the translation of the measured wavefront into a design for refractive optical elements for correction of the X-ray wavefront. We show measurement of the focused beam with and without the corrective optics inserted showing reduction in the size of the focus resulting from the correction to the wavefront.

Journal Keywords: Synchrotron radiation; modeling; wavefront correction; nano focusing

Subject Areas: Technique Development


Technical Areas: Optics